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https://issues.apache.org/jira/browse/HIVE-17781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16211391#comment-16211391
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Mithun Radhakrishnan commented on HIVE-17781:
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+1. Tests pass. Rebasing before commit.
> Map MR settings to Tez settings via DeprecatedKeys
> --------------------------------------------------
>
> Key: HIVE-17781
> URL: https://issues.apache.org/jira/browse/HIVE-17781
> Project: Hive
> Issue Type: Bug
> Components: Configuration, Tez
> Affects Versions: 3.0.0
> Reporter: Mithun Radhakrishnan
> Assignee: Chris Drome
> Attachments: HIVE-17781.1.patch
>
>
> Here's one that [~cdrome] and [~thiruvel] worked on:
> We found that certain Hadoop Map/Reduce settings that are set in site config
> files do not take effect in Hive jobs, because the Tez site configs do not
> contain the same settings.
> In Yahoo's case, the problem was that, at the time, there was no mapping
> between {{MRJobConfig.COMPLETED_MAPS_FOR_REDUCE_SLOWSTART}} and
> {{TEZ_SHUFFLE_VERTEX_MANAGER_MAX_SRC_FRACTION}}. There were situations where
> significant capacity on production clusters were being used up doing nothing,
> while waiting for slow tasks to complete. This would have been avoided, were
> the mappings in place.
> Tez provides a {{DeprecatedKeys}} utility class, to help map MR settings to
> Tez settings. Hive should use this to ensure that the mappings are in sync.
> (Note to self: YHIVE-883)
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